police chief michael keho says it was a horrific scene when he reached the part of the school where 20 first graders and six adults were shot and killed. >> i was devastated. absolutely devastated. i had no words. >> reporter: he says it was clear no one in the classroom could be saved. >> you feel a sense of guilt in that you weren't there quick enough to do that. but i also know that our response stopped that threat, and he could not proceed any further. >> reporter: newtown police officers are wearing bands around their badges in honor of the victims. and they're still searching for answers to explain why lanza targeted the elementary school. theresa garcia, cbs news. >> some of holiday's celebrities are putting their faces and feelings on the gun violence. >> as a human being. >> for the children of sandy hook. >> demand a plan. >> no more lists of names. >> it's not too soon. >> it's too late. >> now is the time. >> before we all know someone who loves someone on that list. >> no more lists. >> the demand a plan campaign appeared just hours after the nra suggested armed guards in